The Australian government’s GeoScience Australia website offers downloads of a wide variety of map and GIS data. There’s a web interface called MapConnect that you can try for selecting topographic and geology data for download and creating custom PDF maps:

But I found it a bit confusing to navigate and use. You might do better to go to some of the other pages that let you browse and/or search for data, even though finding data this way may take a while.

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